{"data":{"id":"us/49-cfr-218.23","jurisdiction":"us","citation":"49 CFR 218.23","heading":"Blue signal display.","body":"(a) Blue signals displayed in accordance with § 218.25, 218.27, or 218.29 signify that workers are on, under, or between rolling equipment. When so displayed—\n(1) The equipment may not be coupled to;\n(2) The equipment may not be moved, except as provided for in § 218.29;\n(3) Other rolling equipment may not be placed on the same track so as to reduce or block the view of a blue signal, except as provided for in § 218.29 (a), (b) and (c); and\n(4) Rolling equipment may not pass a displayed blue signal.\n(b) Blue signals must be displayed in accordance with § 218.25, 218.27, or 218.29 by each craft or group of workers prior to their going on, under, or between rolling equipment and may only be removed by the same craft or group that displayed them.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER II—FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","PART 218—RAILROAD OPERATING PRACTICES","Subpart B—Blue Signal Protection of Workers"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"4e649de6384225e58e93687fd44abb85d846e4ee3436566d307cbc3027af1cd1","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-218.22","next":"us/49-cfr-218.24"},"notice":"GroundRules: Original legal text. Not legal advice."}